Observation

This question was attempted by few candidates and their performance was poor. They could not answer it correctly.
The expected answers are as follows: 

Equipment used in detecting auditory defects

• otoscope;
• audiometer;
• tuning fork;
• guitar strings;
• wrist watch;
• geiger counter/micro R meter/ionization chamber;
• multi channel analyzer/neutron REM meter/radon detectors;
• drum.